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LEGO Tinkering Gearing
Sariel's Gear Calculator - Apps on Google Play
Sariel's Bricks & Pets - A long time ago I've promised to bring some of the utilities I've made at http://tools.sariel.pl/ to Android. Well, the first one is quite likely to get
Sariel.pl » Gear Ratio Calculator 2.1 released
LEGO Gear Calculator free app now available! - YouTube